The invention discloses a fodder mixing device which comprises a bottom plate, a primary mixing assembly, a secondary mixing assembly and a material supplying assembly, wherein an accommodating plateis horizontally arranged above the bottom plate, the accommodating plate and the bottom plate are connected through a supporting rod, and a rectangular discharging hole is formed in the middle of theaccommodating plate; the primary mixing assembly comprises a screening box and a power mechanism, the screening box is a rectangular box device, the top end of the rectangular box device is open, through holes are evenly distributed in a bottom plate of the screening box, the screening box is arranged on the accommodating plate and is in slide connection with the accommodating plate, and the powermechanism can drive the screening box to slide; the secondary mixing assembly comprises an inclined plate, a movable rod and enclosure plates, the inclined plate is obliquely arranged and arranged above the screening box, the two enclosure plates which are perpendicularly arranged are symmetrically arranged o the top surface of the inclined plate, and a stirring mechanism is arranged between thetwo enclosure plates; the material supplying assembly comprises an installation frame and a material barrel, the bottom of the installation frame is fixedly connected with the top end of the inclinedplate, and the material barrel is arranged above the installation frame. The fodder mixing device disclosed by the invention has the advantages of good mixing effect, ability in saving labor and highmixing efficiency.